I have not been able to get his sound files to work since he moved to College Station. Don't know if the move has anything to do with it or not. His caller is the only one I have used since 1973, so I can't comment on any other tube callers. I am sure there are some out there that can sing, but I have no personal experience with any of them.
Why be good when you can B-Mobile or Spin & Strut.